Re: [Discuss-gnuradio] Is that possible combining usrp_fft.py and usrp_spectrum_sense.py to do spectrum analysis and observe in GUI in a wider frequency range?

[Firas A.]

Eric Blossom wrote:
> 
> On Mon, Dec 10, 2007 at 06:38:49PM -0800, Brook Lin wrote:
>> 
>> I have figured out why it failed to set freq. Now my question is still
>> how
>> can I get one GUI with one plot and show all the spectrum, say all FM
>> stations.
>> 
>> Thanks
> 
>>Brook, you'll have to look at the code and figure this out yourself.
>>If you have a more specific question, please ask it.
>>
>>Eric
> 
> Hi,
> 
> I think there is a bug in usrp_spectrum_sense.py code. The bug is in
> calculating the maximum center frequency.
> The used equation is :
> self.max_center_freq = self.min_center_freq + (nsteps * self.freq_step)
> 
> while the correct equation should be :
> self.max_center_freq = self.min_center_freq + ((nsteps-1) *
> self.freq_step)
> 
> Example :
> using usrp_spectrum_spense.py :
> 
> if :-
>                    min_freq = 5MHz, max_freq = 30MHz, usrp_rate = 8MHz,
> 
> then :-
> 
> freq_step = 0.75 * 8 = 6MHz
> nsteps = math.ceil(( 30 - 5 ) / 6 ) = 5
> min_center_freq = 5 + 6/2 = 8MHz
> max_center_freq = 8 + 5*6 = 38MHz   (which is too high)
> 
> Regards,
> 
> Firas,
> 
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> 

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